Hubble Space Telescope Identification of the Optical Counterparts of Ultraluminous X-ray Sources in M51

Details Hubble Space Telescope Identification of the Optical Counterparts of Ultraluminous X-ray Sources in M51 Hubble Space Telescope Identification of the Optical Counterparts of Ultraluminous X-ray Sources in M51

2006-03-20

arxiv.org/abs/astro-ph/0603528v1

Astrophys.J. 645 (2006) 264-270

Astronomy and Astrophysics

Astrophysics

10 pages, 5 figures, accepted for publication in ApJ

Scientific paper

10.1086/504251

We present the results of a search for optical identifications of ultraluminous X-ray sources (ULXs) in M51 by using mosaic images taken with the Hubble Space Telescope Advanced Camera for Surveys in filters F435W (B), F555W (V), F814W (I), and F658N (Halpha). Our sample consisting of nine ULXs is defined by analyzing the three Chandra observations of M51 performed in 2000 June, 2001 June, and 2003 Aug. We found four ULXs have one or two candidates for counterparts, while two have multiple stars within their error circles. The other three have no candidate counterparts. Four ULXs are located near or in a star cluster, while others have no association with a cluster. These results indicate that the companion star, environment, and origin of ULXs are probably heterogeneous.

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